scholarly journals NUMERICAL SIMULATION OF ELECTROMAGNETIC AND THERMAL FIELDS IN INDUCTION CHANNEL FURNACES WITH DEFECTS OF LINING

2018 ◽  
Vol 2018 (4) ◽  
pp. 33-36
Author(s):  
M.А. Shcherba ◽  
Keyword(s):  
Numerical Simulation ◽  
Thermal Fields ◽  
Induction Channel

scholarly journals Implementation of Surface Radiation and Fluid-Structure Thermal Coupling in Atmospheric Reentry

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Ojas Joshi ◽  
Pénélope Leyland
Keyword(s):  
Numerical Simulation ◽  
Radiative Heating ◽  
Surface Radiation ◽  
Radiative Cooling ◽  
Thermal Coupling ◽  
Total Heat Flux ◽  
Hollow Cone ◽  
Atmospheric Reentry ◽  
Thermal Fields ◽  
Flap Region

During atmospheric reentry, radiative heating is one of the most important component of the total heat flux. In this paper, we investigate how the thermal radiation coming from the postshock region interacts with the spacecraft structure. A model that takes into account the radiation reflected by the surface is developed and implemented in a solid solver. A partitioned algorithm performs the coupling between the fluid and the solid thermal fields. Numerical simulation of a hollow cone head and a deployed flap region shows the effects of the radiative cooling and the significance of the surface radiation.

Simulation and Identification of Nonstationary Heat Transfer in a Nonuniform Friction Contact

1993 ◽  
Vol 115 (2) ◽  
pp. 299-306 ◽  
Author(s):  
O. Bogatin ◽  
I. Chersky ◽  
N. Starostin
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Three Dimensional ◽  
Unit Element ◽  
Separation Coefficient ◽  
Friction Contact ◽  
Nonstationary Heat Transfer ◽  
Thermal Fields ◽  
Simulation Results ◽  
Marching Method

The results of numerical simulation of nonstationary thermal fields in cylindrical friction junctions are presented. On the basis of the marching method, a numerical algorithm which imposes no restrictions on the value of heat flow separation coefficient is constructed. Simulation results are given for different bearing designs both for the two and three-dimensional cases. Using the developed algorithm as a base, a method allowing for reconstruction of heat release and, hence, friction moment values from temperature measurements in the stationary unit element is suggested. Reliability of the results is proved by experiments.

scholarly journals Three-dimensional inhomogeneous thermal fields of the “Photon-Amur 2.0” payload electronic board developed for nanosatellites

2021 ◽  
Vol 20 (2) ◽  
pp. 74-82
Author(s):  
D. V. Fomin ◽  
M. A. Barulinа ◽  
A. V. Golikov ◽  
D. O. Strukov ◽  
A. S. German ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Thermal Effect ◽  
Outer Space ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Control Board ◽  
Electronic Components ◽  
Thermal Fields ◽  
Electronic Board ◽  
High Orbit

The thermal fields of the Photon-Amur 2.0 payload electronic board developed for nanosatellites were studied. The Photon-Amur 2.0 payload consists of an electronic control board with a casing mounted in a nanosatellite and a remote panel with experimental photovoltaic converters. A modified heat balance method was used for numerical simulation of the thermal fields of the control board and the casing. The constructed model and the obtained results of the numerical simulation were verified by comparison with the thermal diagrams obtained for the Photon-Amur 2.0 electronic board under normal operating conditions. For modeling the outer space operating conditions, it was assumed that there is a vacuum outside and inside the Photon-Amur 2.0 casing, and the thermal effect is transmitted from the nanosatellite racks to the payload electronic board through the fastenings. The thermal effect is of a periodic nature with amplitude of 45 to +80○C and a period of 96 min, which approximately corresponds to the motion of a nanosatellite in a 575 km-high orbit. It was demonstrated that with such composition of the payload module, its casing can work as a passive thermoregulator of thermal fields on the electronic board of Photon-Amur 2.0. The simulation showed that the casing helps to keep the temperature on the control board in the interval of 15C to +85C, which is acceptable for the electronic components used on the payload control board.

Numerical Simulation of Turbulent Thermal Fluid in Tee Water Duct Cooled Nuclear Reactor

2015 ◽  
Vol 789-790 ◽  
pp. 484-488 ◽  
Author(s):  
Fethi Saidi ◽  
Mohammed Aounallah ◽  
Mustapha Belkadi ◽  
Lahouari Adjlout ◽  
Omar Imine
Keyword(s):  
Numerical Simulation ◽  
Nuclear Reactor ◽  
Three Dimensional ◽  
Good Prediction ◽  
Wall Function ◽  
Reversed Flow ◽  
Ansys Fluent ◽  
Thermal Mixing ◽  
Thermal Fields ◽  
Buoyancy Forces

The turbulent and thermal mixing in a vertically oriented T-junction is investigated numerically using ANSYS FLUENT software. By taking account the buoyancy forces, a steady state three-dimensional turbulent flow is considered with a Reynolds number of 0.4×105 at the cold inlet and 3.3×105 at the hot entrance. The k-ε standard model with standard wall function is chosen to provide closure for the Reynolds stress tensor. The numerical results presented in the form of velocity vectors field and contours of temperature distribution gave a good prediction of the dynamic and the thermal fields namely in the mixing region where a reversed flow is captured.

Simulation of Wind Influence on the Thermal Processes in Gas-Shielded Welding

2014 ◽  
Vol 682 ◽  
pp. 91-95 ◽  
Author(s):  
Dmitry A. Chinakhov ◽  
A.V. Vorobyev ◽  
Yu.M. Gotovshchik
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Heat Affected Zone ◽  
Consumable Electrode ◽  
Thermal Processes ◽  
Shielding Gas ◽  
Thermal Fields ◽  
Wind Influence ◽  
Welding Processes

A set of various factors and phenomena defines the quality of welded joints. This is especially noticeable for outdoor welding. A numerical simulation of welding processes with consumable electrode with traditional and two-jet gas shielding was carried out to study the influence of wind speed on the movement of the shielding gas (CO2) and the change of thermal processes in the heat affected zone. It is established that the use of two-jet shielding in welding with a consumable electrode leads to an increase in hardness of the shielding gas stream and lower offset of thermal fields in the welded product in the wind direction. It testifies to a better quality of shielding and smaller probable changes in symmetry of structure formation and mechanical properties of the heat affected zone.

scholarly journals Numerical Simulation of Coal Microwave Heating and Evaluation of The Reliability of The Results By Changing The Parameters Affecting It

2021 ◽  
Author(s):  
Ali Jebelli ◽  
Arezoo Mahabadi ◽  
Rafiq Ahmad
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Microwave Heating ◽  
Coalbed Methane ◽  
Coal Mines ◽  
Effective Parameters ◽  
Mining Operations ◽  
Thermal Fields ◽  
Underground Coal Mines ◽  
Increase Rate

Abstract In most mines, methane gas is accumulated in pores inside coal, the highest amount of which is found in coal mines, and methane is the most important polluting gas in underground coal mines. In coal mining operations, coalbed methane is one of the potential hazards that must be extracted to prevent an explosion of the accumulated gas and environmental pollution. One of the mechanisms is using microwave irradiation so that the thermal stress caused by microwave heating generates fractures. In this research, we investigated the most important parameters affecting the electric and thermal fields’ distribution in coal in order to identify the effective parameters that achieve the highest temperature increase rate and to reach the highest impact and efficiency of the system with the least amount of consumed energy. The results of this study show that the most effective parameter on the electric and thermal fields’ distribution within coal is the size of the resonance chamber.

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